DC Generators » Exercise - 14. In D.C. generators, the cause of rapid brush wear may be : (a) severe sparking (b) rough commutator surface (c) imperfect contact (d) any of the above
DC Generators » Exercise - 13. In D.C. generators the pole shoes are fastened to the pole core by : (a) rivets (b) counter sunk screws (c) brazing (d) welding
Transformer » Exercise - 15. Transformer cores are laminated in order to : (a) simplify its construction (b) minimise eddy current loss (c) reduce cost (d) reduce hysteresis loss
DC Generators » Exercise - 15. For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ? (a) Lap winding (b) Wave winding (c) Either of (a) and (b) above (d) Depends on other features of design